To kee kee on the slate call run your striker 1/2" off the rim of the call with more than normal downward pressure.
Hold your striker lower closer to the tip try about 1/2" above the slate that should work for you. You can adjust this accordingly as you start to get the kee kee. Some slates will only do this at certain areas on the call surface so go around the call to find the sweet spot for this call. Vary the angle of your striker to get the desired pitch. This will work with a little practice. Let me know how it works for you.
I hunted one of my honey holes thisafternoon and found nothing its just like they dissapeared? I will be out again tomorrow I have never had a season such as this. By this time they should be scratching since all of the leaves are down it is definately a season to remember. Good Luck!